package/containerd: bump to version 1.6.8

https://github.com/containerd/containerd/releases/tag/v1.6.8

Signed-off-by: Christian Stewart <christian@paral.in>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/containerd/containerd.hash

@@ -1,3 +1,3 @@
 # Computed locally
-sha256  27afb673c20d53aa5c31aec07b38eb7e4dc911e7e1f0c76fac9513bbf070bd24  containerd-1.6.6.tar.gz
+sha256  f5f938513c28377f64f85e84f2750d39f26b01262f3a062b7e8ce35b560ca407  containerd-1.6.8.tar.gz
 sha256  4bbe3b885e8cd1907ab4cf9a41e862e74e24b5422297a4f2fe524e6a30ada2b4  LICENSE

package/containerd/containerd.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-CONTAINERD_VERSION = 1.6.6
+CONTAINERD_VERSION = 1.6.8
 CONTAINERD_SITE = $(call github,containerd,containerd,v$(CONTAINERD_VERSION))
 CONTAINERD_LICENSE = Apache-2.0
 CONTAINERD_LICENSE_FILES = LICENSE